Warren Buffett sold chewing gum and Coca-Colas and delivered newspapers.

First Job(s): Starting at age 6, Buffett would go door to door and sell packs of chewing gum. His other door to door sales stints included selling magazines and Coca-Cola's. He also ran a newspaper delivery route.

Wall Street Career: Buffett (a.k.a. "The Oracle of Omaha") is the chairman and CEO of Berkshire Hathaway and is widely considered one of the most successful investors.

Ray Dalio worked as a caddy at a golf club as a kid.

First Job: When Dalio was just 12-years-old, he worked as a caddy at a golf club frequented by Wall Street types. As a caddy, Dalio was able to make $6 a bag and he later took those funds to buy his first stock.